text: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you under the Apache License, Version 2.0 (the
   * "License"); you may not use this file except in compliance
   * with the License.  You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  #include "org_apache_hadoop.h"
  #include "org_apache_hadoop_io_compress_lz4_Lz4Decompressor.h"
  
  #ifdef UNIX
  #include "config.h"
  #endif // UNIX
  #include "lz4.h"
  
  
  static jfieldID Lz4Decompressor_compressedDirectBuf;
  static jfieldID Lz4Decompressor_compressedDirectBufLen;
  static jfieldID Lz4Decompressor_uncompressedDirectBuf;
  static jfieldID Lz4Decompressor_directBufferSize;
  
  JNIEXPORT void JNICALL Java_org_apache_hadoop_io_compress_lz4_Lz4Decompressor_initIDs
  (JNIEnv *env, jclass clazz){
  
    Lz4Decompressor_compressedDirectBuf = (*env)->GetFieldID(env,clazz,
                                                             "compressedDirectBuf",
                                                             "Ljava/nio/Buffer;");
    Lz4Decompressor_compressedDirectBufLen = (*env)->GetFieldID(env,clazz,
                                                                "compressedDirectBufLen", "I");
    Lz4Decompressor_uncompressedDirectBuf = (*env)->GetFieldID(env,clazz,
                                                               "uncompressedDirectBuf",
                                                               "Ljava/nio/Buffer;");
    Lz4Decompressor_directBufferSize = (*env)->GetFieldID(env, clazz,
                                                           "directBufferSize", "I");
  }
  
  JNIEXPORT jint JNICALL Java_org_apache_hadoop_io_compress_lz4_Lz4Decompressor_decompressBytesDirect
  (JNIEnv *env, jobject thisj){
    const char *compressed_bytes;
    char *uncompressed_bytes;
  
    // Get members of Lz4Decompressor
    jobject compressed_direct_buf = (*env)->GetObjectField(env,thisj, Lz4Decompressor_compressedDirectBuf);
    jint compressed_direct_buf_len = (*env)->GetIntField(env,thisj, Lz4Decompressor_compressedDirectBufLen);
    jobject uncompressed_direct_buf = (*env)->GetObjectField(env,thisj, Lz4Decompressor_uncompressedDirectBuf);
    size_t uncompressed_direct_buf_len = (*env)->GetIntField(env, thisj, Lz4Decompressor_directBufferSize);
  
    // Get the input direct buffer
    compressed_bytes = (const char*)(*env)->GetDirectBufferAddress(env, compressed_direct_buf);
  
    if (compressed_bytes == 0) {
      return (jint)0;
    }
  
    // Get the output direct buffer
    uncompressed_bytes = (char *)(*env)->GetDirectBufferAddress(env, uncompressed_direct_buf);
  
    if (uncompressed_bytes == 0) {
      return (jint)0;
    }
  
    uncompressed_direct_buf_len = LZ4_decompress_safe(compressed_bytes, uncompressed_bytes, compressed_direct_buf_len, uncompressed_direct_buf_len);
    if (uncompressed_direct_buf_len < 0) {
      THROW(env, "java/lang/InternalError", "LZ4_uncompress_unknownOutputSize failed.");
    }
  
    (*env)->SetIntField(env, thisj, Lz4Decompressor_compressedDirectBufLen, 0);
  
    return (jint)uncompressed_direct_buf_len;
  }
  